package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.dto.SetmealDto;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.entity.SetmealDish;
import com.itheima.reggie.mapper.SetmealMapper;
import com.itheima.reggie.service.SetmealDishService;
import com.itheima.reggie.service.SetmealSetvice;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

/**
 * @author Fs
 * @date 2022 06 15 16:03
 */

@Service
@Slf4j
public class SetmealSetviceImpl extends ServiceImpl<SetmealMapper, Setmeal> implements SetmealSetvice {

    @Autowired
    private SetmealDishService setmealDishService;

    /**
     * 新增套餐，同时需要保存套餐和菜品的关联关系
     *
     * @param setmealDto
     */
    @Transactional
    @Override
    public void saveWithDish(SetmealDto setmealDto) {
        //保存套餐的基本信息，操作setmeal，执行insert操作
        this.save(setmealDto);

        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        setmealDishes.stream().map((item) -> {
            item.setSetmealId(setmealDto.getId());
            return item;
        }).collect(Collectors.toList());

        //保存套餐和菜品的关联信息，操作setmeal_dish,执行insert操作
        setmealDishService.saveBatch(setmealDishes);
    }

    /**
     * 删除套餐 同时需要删除套餐和菜品的关联数据
     *
     * @param ids
     */
    @Transactional
    @Override
    public void removeWithDish(List<Long> ids) {
        // 查询套餐状态 确定是否可用删除
        LambdaQueryWrapper<Setmeal> lqw = new LambdaQueryWrapper<>();
        lqw.in(Setmeal::getId, ids);
        lqw.eq(Setmeal::getStatus, 1);

        int count = this.count(lqw);
        if (count > 0) {
            throw new CustomException("套餐正在售卖中，不可删除");
        }

        // 如果可以删除 先删除套餐表中的数据 setmeal
        this.removeByIds(ids);

        LambdaQueryWrapper<SetmealDish> setmealDishLambdaQueryWrapper = new LambdaQueryWrapper<>();
        setmealDishLambdaQueryWrapper.in(SetmealDish::getSetmealId, ids);
        // 删除关系表中的数据 setmeal_dish
        setmealDishService.remove(setmealDishLambdaQueryWrapper);
    }

    /**
     * 根据id查询套餐信息和对应的菜品信息
     *
     * @param id
     * @return
     */
    @Override
    public SetmealDto getByIdWithFlavor(Long id) {
        // 查询套餐信息 从setmeal表查询
        Setmeal setmeal = this.getById(id);

        SetmealDto setmealDto = new SetmealDto();
        BeanUtils.copyProperties(setmeal, setmealDto);

        // 查询当前套餐对应的菜品信息 从setmeal_dish表查询
        LambdaQueryWrapper<SetmealDish> lqw = new LambdaQueryWrapper<>();
        lqw.eq(SetmealDish::getSetmealId, setmeal.getId());
        List<SetmealDish> dishes = setmealDishService.list(lqw);
        setmealDto.setSetmealDishes(dishes);

        return setmealDto;
    }

    /**
     * 修改套餐
     * @param setmealDto
     */
    @Transactional
    @Override
    public void updateWithFlavor(SetmealDto setmealDto) {
        // 更新setmeal表基本信息
        this.updateById(setmealDto);

        // 清理当前套餐对应菜品数据 setmeal_dish表的delete操作
        LambdaQueryWrapper<SetmealDish> lqw = new LambdaQueryWrapper<>();
        lqw.eq(SetmealDish::getSetmealId, setmealDto.getId());

        setmealDishService.remove(lqw);

        // 添加当前提交过来的菜品数据 setmeal_dish表的insert操作
        List<SetmealDish> dishes = setmealDto.getSetmealDishes();

        dishes = dishes.stream().map((item) -> {
            item.setSetmealId(setmealDto.getId());
            return item;
        }).collect(Collectors.toList());

        setmealDishService.saveBatch(dishes);
    }
}
